Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Business Combination, Contingent Consideration, Liability	$ (13,048)
Cash flows from operating activities:
Net income	83,413	52,848
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	38,273	38,864
Stock-based compensation	25,330	23,703
Excess tax benefits from stock-based awards	(8,092)	(139)
Other non-cash items, net	626	138
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	16,737	22,185
Accounts payable, accrued expenses and other current liabilities	(3,346)	(6,111)
Accrued compensation and benefits	(34,285)	(18,631)
Deferred revenue	29,683	30,843
Accrued and deferred income taxes	5,879	(40,553)
Other current assets and prepaid expenses	(2,193)	(3,197)
Other noncurrent assets and liabilities	(5,061)	(3,518)
Net cash provided by operating activities	146,964	96,432
Cash flows from investing activities:
Additions to property and equipment	(10,342)	(12,426)
Acquisitions of businesses, net of cash acquired	(111,519)	(222,423)
Net cash used by investing activities	(121,861)	(234,849)
Cash flows from financing activities:
Borrowings under credit facility	474,375	0
Repayments of borrowings under credit facility	(414,375)	(61,875)
Repurchases of common stock	(39,965)	(34,947)
Proceeds from issuance of common stock	716	2,874
Excess tax benefits from stock-based awards	8,092	139
Payments of Debt Issuance Costs	(4,120)	0
Payments of withholding taxes in connection with vesting of stock-based awards	(21,637)	(12,891)
Net cash provided (used) by financing activities	3,086	(106,700)
Effect of exchange rate changes on cash and cash equivalents	368	(3,617)
Net increase (decrease) in cash and cash equivalents	28,557	(248,734)
Cash and cash equivalents, beginning of period	241,913	489,543
Cash and cash equivalents, end of period	$ 270,470	$ 240,809